<?php
header("content-type:text/html;charset=utf-8");
require_once 'db_conn.php';
$conn;
$sql="SELECT * FROM  t_message ";
$result=$conn->query($sql);
echo"<pre>";
$rows=$result->fetch_all(MYSQLI_ASSOC);
print_r($rows);
foreach($rows as $value){
    echo "<br/>";
    echo $value['username']."说：".$value['content'];
}

